// ------------------------------------------------------------------------------
// 
// Copyright (c) 2008 Swampware, Inc.
// 
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
// 
// ------------------------------------------------------------------------------
using System;

namespace Water.Commands
{
	/// <summary>
	/// Summary description for ParallelTask.
	/// </summary>
	public class ParallelTask
	{
		private Water.List _task;
		private Water.Environment _environment;
		private Water.Evaluator _evaluator;
		private object _result = null;
		private ParallelTaskException _error = null;

		public ParallelTask(Water.List task, Water.Environment environment, Water.Evaluator evaluator)
		{
			this._task = task;
			this._environment = new Water.Environment(environment);
			this._evaluator = evaluator;
		}

		public object Result
		{
			get { return this._result; }
		}

		public ParallelTaskException Error
		{
			get { return this._error; }
		}

		public void Execute()
		{
			try
			{
				//TODO new Environment
				this._result = this._evaluator.EvaluateList(this._task, this._environment);
			}
			catch (System.Exception exception)
			{
				this._error = new ParallelTaskException(exception, this._environment.CopyVariableStack("_Statement"));
			}
		}

	}
}
